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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3489d48a9a725231e262c2fe991aaa8eab54daea35027bc2b9d44d85a2dd809f' 
  AND token = '07sRV8qE/LaLvmZCv/WlAJC/Thl/6lNCJA0+k0BLULM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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