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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8e15b2631285d78be3dd2dc479bf2e5c141c9d0fb2b1c85c7b9aa0e22cbb2fc' 
  AND token = '1uNsk8O3dek/4mo4ssxK70osz7KNiYO7/3eIXFZNXQo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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