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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce1562d4658a0b581d6863a68b0243c69eb4580b1da28b92a4acbd16be25b06e' 
  AND token = 'Z/MZjp03pH79RlTzJrTIwzwkkc3i56s7c0nQnDIrta8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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