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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c519d91905881251777541220ba2643164650bb58924dcec6df6571ab30d604e' 
  AND token = 'FTPM+D7XBjw1ImXpYhjpSypD11nfscoa1Mo+bW+8Arw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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