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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0af238e3d389900f4c105e57bfd5abaabdcf61a5a2ebf4779bf4498c3f2dd72' 
  AND token = 'AC3PUEyWYiL39Jqg50nWXNJeFiw4SmzfZSkGL4OYfCE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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