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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93577aee68ee40a67edf7f779e131bc2f45f1515c3e2155d7383c5961849d8d3' 
  AND token = '5NQHLadv5uuOjjGCviKarKC0rcDitP/E6zX0mRD8kYs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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