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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee61ec3582eb12d044bc6724cbe2fefbfc048ea712396d1d6d917193000698de' 
  AND token = 'AtNZsrEIiekQw+9Bb/QfwoOSEs5iDfXk/1jJP8w/kmQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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