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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20ae0638836062ef3fe3d99f8d9c0c97a0d441a5f431b0e6032090b27118c67e' 
  AND token = 'vs/sErYA/G1GcJx1payL1XlsN1lvcQlscwnKmjRN5c0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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