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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30e56df7bea9091c4948e3102b8a94caeeadf380958b9a9842847a4c8063dce4' 
  AND token = 'pvpAnDR++3lIp/gAzbJ3kpnhb5mcpXoX+NcSi6NtPZI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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