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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55588a24946f68e803ac0864a59ed3ea7e056c74699d9afdbc0e6f2f0c6c4944' 
  AND token = 'YbROeCJhTe8ACqhqHdRL44uVRe0MXPSqjHuDNiMDJE8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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