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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e54a9dd99ed5ac30103c16042b6f9af0769377b4005f5a55f539b447c2e660b' 
  AND token = '1ahWwyYzaPfQfx304+eQPkas9c2EMDE1PoI6//lmd1U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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