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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a55121698a14559807bf220c56550005ac425be148f2d883fa726efbee9f59ee' 
  AND token = '/F3CwxYJOe24MipnJmreHr1i+9CBA26Sqd9rrxWcF/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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