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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c42c03ef3678845def916499720e770f29e8fdcb4dfda26e02460490610ea040' 
  AND token = 'tF6n/DQeCIMTkXxWFD591eMZsaSLQLDn0pA9Urv5FMo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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