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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3779b9a1a180969db92fda196da3f9e170f4fa5d0a15f588c227ab05ab66a8d0' 
  AND token = '7ym6mFhKrA1JjhpbM2kboGqF/oYXLIiQpai7c/3bVhk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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