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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8824364394b26a726338b6f24ca0a8671f5b4d7c2ccfe8cc9e4a3bf148bb48e2' 
  AND token = 'g8gnvjHTceibc0jyb8MpJ9Y+a5VfOrqaDtzMvATEKp8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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