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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '396db4070cdac486c72e41ec72d577d8c45b86e90e89bdcf6a5b015ab87104c9' 
  AND token = 'o/PDraVmbzo82p01qO1dPBIBWjqb7m0cCS/eHyz8yu4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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