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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2dd17f8c624409b583fca4c187938a9d6d5aa2cfd6df882c852c817208809bca' 
  AND token = '3HvrrvBMJQzfNYf31SgxJof3ZFCa7OIIxDKvRfZfNAM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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