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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56c63b238474a919cbf7a567792a3b56d28bdaed5bc31154348a42c6a05dae52' 
  AND token = 'uG2WBQgbbP788vP8LAnqdhtusruXqO80oONGOw6l/pY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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