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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '085bad92a1505dd2a8e2e1d2c2a109cf971b873b4bde47823eaf0c479f8ab5b8' 
  AND token = 'q9AQ54n4wLd4yAjxHh+bgARinj4VqkUKeb+L3JCYqFg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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