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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5046c410bb0f4b3fda5dfd18ecc0287d94b9d8d05eff5665cfbcf6eb7c56fbf9' 
  AND token = 'RDGwW9gUatR36yn3Py2yMe2ZvaUJRHzUQ8fjy1ybqcU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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