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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf6904c1ebbf7962f8b80d028ecc5a7f07449364d87893ae557a5652c00cdfc1' 
  AND token = 'hcA0fmAk1yXaHgk2R5amCgn/WqQRr+o9Vh/SNUmwMp4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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