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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51d627cc0248df221baa7e8aca21bafd2b3776f68d1594cb863929d5ff5ec22c' 
  AND token = '/N9JJgK6OswEGd4Py6EWx0qEzh4rTAlXWN4/O2nM5uk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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