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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a302651c91b9d39970176db3b6c921d356f1e1f602020df6f2afb52a0e1e2b3e' 
  AND token = '2PUVUZSu8Q871TXncRDQM6nMGtUxS5e3SeMTvuRcU6I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00113

JSON explain

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