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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a35bee4f1680af00bac72457ff132a3d145186452fba1f9940a46c16d03f3c1' 
  AND token = 'ctVJd16wACpziPNJvb80xOwfsp9CJgOh81vfe9JGBOM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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