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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '595952c989f05c6de6400bf48db58ad9b5399b4d6f72f70849f6189c529e6888' 
  AND token = 'tOeS4jtyecqU1S1qrasNFawrtTLriS1Vri29xPF2dsc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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