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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6c75fcaef1879b716084ab525b4ebdd86c10896a2898c1592562d6adfdbc86d' 
  AND token = 'J8vjo/Rj71B+nifasUrP0NgwtNi3b9npDzg+8EvkWJE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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