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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba8ca3fd90c209b0b1d3b3cb74bae8d2aa08e122d93179cc6898fc0f42598f8d' 
  AND token = 'MekoKHgv99Rvuq5THZeXf8o2CDXo1qwWuJZuydHR9PE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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