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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14c8bbe3626995d4956a8d0e7d710a825cbd06db07f57884160642bf6c0ccc64' 
  AND token = 'T1bblO0WFWYb+14pXF6l2aFDjGGCOG7GUH11O4ttOmc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}