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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04262d958711d4a05531a3d0317237c308fde38f5c64b6c932e94f043e0b0a28' 
  AND token = '4hs0wreSca01CT4t4ujCZ41QX/sz90DNZFCVeDx57VY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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