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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea655035a37137428ac1fca852e3c7b6a8f5e214162a7c6b0401381b61eabd3a' 
  AND token = '2OhlaR9To3YoqDRjPP1dL8kyV6dQU4qFYVPRI7Zk74o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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