SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f43f4f23b95c7bdca4a44231937f478b6915d888b5b6ee6490a26f1dd932dd9' 
  AND token = 'cPjnz+4Cy7nOgLtIHhvEiAz8QKc5kYJ/U47rKw2hlek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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