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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea5dfdaff1939027a9bb87bc592dae53e1fb47269e2f5aa43a8dc71ee6f96ea4' 
  AND token = 'mhljf0dHwb6IAYmjgt0rJypvIPDe7YvQ92p9Aa0GgEQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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