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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5997d5bbf57209d3893b0ea602d859b820033de6a6b9d096dd3a23712121c32' 
  AND token = 'p4WZtq3ix5OC+9AMcQdaKE92sqo9xlyUjYLaoyLg1e8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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