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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e504a242459a8494a398e06eac2b46277450bef6f7b0bb5e6d9ebc92569f904' 
  AND token = '9+zQpna8iLDEiNz7etGocxEsk/4ii6ytYakiEb3Obus=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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