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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53a7e686b0556cc47294c80f6ec9c1d1372fbd0ce4eecf6c444be3e96d8822e8' 
  AND token = 'Gpknba16WkG9gZYRKkcr86rgE7ptTa1bG+btQRdCK1w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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