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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88115115af1207b1a92c54fe63916f5965cbaede1307f5d88031385180d2c516' 
  AND token = 'BtdgkMxUvCr8QpJtc6stqoyXEaUZ+4QyBU9ERoWW8xc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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