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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91f45374be561af7ae757cc05a2067b8ce7d53b33e10bc03c3b4a448eff2b323' 
  AND token = 'CXfYwXZsjGbK48x7sPIp4WP1e3WsaNM1NBcrwmXrNgQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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