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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf88817a45cf1e1e3ba35cefaa064509be7bb73bb0c6cf6ee046704328ab8462' 
  AND token = 'n160LIuzBnRwRMJBq4C3Camq6tp8GNsAx8Vz9zO21SI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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