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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b97579905732b5d292dc8ca4c27aeba40ad467ec74ef5d835ce5cc5ec8f059f' 
  AND token = 'BIl/H1RepIKPgpjYM2HR0kR+ZXBqi3bY/nH56jmCDsk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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