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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31f41f4b2a40d491c5c2067b58c362ec556a2963b1a8fba2c63af857efcaa2fe' 
  AND token = 'Cn08IHjZom1m/t12bOWIltTUW182h+1GLruP9AIZ7x8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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