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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e509ac23484cf7136ce0622a1d3cfa2fd96bd05a900edbaca950f0a1e7c10ef' 
  AND token = 'qcmlbL1Mq6lZhFrmdhgiiruRWahoi3eUc9BVy1m0UmM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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