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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa9f7d38d70f4129e3aa36276a0ee77769e3c4eb96126c8f7e7b8a633d3478e1' 
  AND token = 'IRb6Wg9GVcYCT3O/K4Q4CnDt3PZtjFILYx6dF9k+yps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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