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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46c259f04bebeb22dd16666eaeb26da1da1d514ab13bfe4580883136da9f122f' 
  AND token = 'rbngugteC3LZ6Cj8KqXDAZwncm53ad9IMFzwT/Cxd04=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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