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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ac97fc2a1fd4d4feb6bedf6580d8a6e1382c2ab45cf22d855a04ec0af7ed4be' 
  AND token = 'gDs9cINbpzao9CwEUXWKI4O5jUdhRC8YIsSh2YC8kno=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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