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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c113c62f6ebc2b249ab27efe780e36dfeb3ff1d9f268b705d0a078f378565d81' 
  AND token = '9V5SvChIWebRGojaMDaY0JdgeawXCOpO/g99drK0yOE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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