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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2c6d1b077441aa1a26cd66595157a870b935aaf6e48aa780a7b340e8d6ba030' 
  AND token = 'a9QDpqY0hh0KEYmOa7Zexf5nPQ7SkHydi+ydWAq8B4Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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