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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7432b6c32b5087ecb2a42ebf3a7c36e3d6051a31c0c7935872eb2af0535b4bae' 
  AND token = 'yXrU34x2otEt9T+Thyg9SR6/vO+ELiKFqS/vByeuuXg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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