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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '101b7c102a3bfe8ab6317fa9fe3bff4d710a41b2aa41d328e4403e1f697816d1' 
  AND token = 'jdAFsg7oITvoRomUhpYWwqPXx79Avmng0j8xbHTz1w8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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