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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4daa01ae83426a454556a59f65acd2bffebefdb845321a5fef68dd1fb41259a' 
  AND token = '7BWrMRbWCMnKfzifon+EH+6irRNssgMf6MiGV+3Lla4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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