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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54148cc45c37b459a447a0e2578e3437564ad32f5cb8b5c4caf9fb5cb31c1e70' 
  AND token = '1v9IEeQ38cae1lUe02Jh1dBReVd3INYDYEuIk2KQTWY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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