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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c496be20a29a7c25ec9a7d8cb802232187986b5054e3e29bd4502b8884269844' 
  AND token = 'DnHEQwXrIv9LzFu+FW6KOgTKUV01a56RaWkc+VRSVPE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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