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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c30975e25cda71d213e4eb1525add8ae0b2d442e505e04f6ef65860107582cb' 
  AND token = '1wfdrkre/IDyL2sZtSLyEVZ9AkW58e2osZ4qzYvvM2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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