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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9a3740244efb5a777d9fa2cc68f8f9841c23b5ad03e2f3877f3ef73b0ced7d3' 
  AND token = '9djo0ie2PvDhDS/ZPjdSJKQzUv73OzXxF5UlF4Oq/D8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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