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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c32a44e7bfc14d0d4f123f54363a5c8fb14101189eb55c1a2fd0250f5f2d10ad' 
  AND token = 'Urxae9z5gyXPqu21h9J1S/nWkTD8yr2B+j94AYH9eC0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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