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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '034e1ab4d8b284326af307533437f790830bc1e76194032d94354d02bc923bc5' 
  AND token = '11sO/2ZxbnW30eT56Y7ZOJKSNre28VJozDdDMlqI8l4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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