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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0dd145cc8c49d2d51c67ddc650406f1a7ff4760a8667f8d8f079fcb6d4819cb' 
  AND token = 'AgLQJSQl/BLACOXmJibJ/ezznFJI8YEobnDtK7teHFI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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