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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74bc174c6cc4e7d676e584d666f1e78f04093944af6bd978251de614a6a46748' 
  AND token = 'lwGkLf7eLgIv1UC2gOeMxGp9McFIrK6U0cwTGMZ4r34=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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