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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b43b09fcb469ffc7d5f008b07eb4aaf3c530e6397bad103ddffd4872adef02b' 
  AND token = 'iDhuJiH43yPejwOZNlzPohLf50KoBN1vw0QYydoxlKE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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