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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29a7b9bb46b6c53baa5ad2b4e8ee81ca6530c3e964006c7aca4fc0806d4702ca' 
  AND token = 'gAlyoDshOc4702eueEaIxxxu8kdt4ugkbxyjWNvrz4k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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