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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c99ad7ae739b837e4a90e28db67506bff038964537275cb51750e36fdec3ab7f' 
  AND token = 'F1EVD56WtyGti42CcNSqb+MadX7nRH9uNSQaXiRR45s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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